CHM 101 NAME _____________________________

GAGE
FALL 2007 September 28, 2007

EXAM 1

Be sure to show all set-up and work to receive credit for problems.

I. Multiple Choice. Select the best response for each of the following statements or questions. (36)

_____1. Which of the following is a chemical property of iron?

a. Density = 7.874 g/cm3. c. Iron corrodes in moist air.

b. Iron melts at 1808 K. d. Iron is soft when pure.

_____2. If you express the number 0.000568 in scientific notation with two significant figures it would be:

a. 5.7 x 10-3 b. 5.7 x 104 c. 5.68 x 10-4 d. 5.7 x 10-4

_____3. Some common ions based on metals are:

a. Li1+, Ba2+, Ni2+ c. Li2+, Ba3+, Ag2+

b. Li1-, Ca2+, Cu2+ d. Fe1+, Ba4+, Al2+

_____4. A student makes a repeated measurement of the length of an object and obtains the following data: 34.5 cm, 35.0 cm, 32.6 cm, 32.0 cm, 33.8 cm. The value measured by an accurate independent source is 35.0 cm. You can say that the student is:

a. accurate and precise c. accurate but not precise

b. precise but not accurate d. neither accurate nor precise

_____5. An atom of arsenic contains 47 neutrons. The mass number of the atom is:

a. 47 amu b. 80 amu c. 74.92 amu d. 74.92 g

_____6. Which element contains 34 electrons?

a. sulfur b. silver c. selenium d. serinium

_____7. Which of the following is a physical change?

a. condensation of alcohol c. release of light by heated Mg

b. metabolism of glucose d. addition of Na to water


_____8. Which sample below would contain individual atoms?

a. oxygen gas c. white gold

b. sodium chloride in water d. water

_____9. The nucleus contains:

a. electrons and neutrons only c. protons only

b. protons and neutrons only d. neutrons only

_____10. Vanillin contains 63.15% C, 5.30% H, and 31.55% O whether it is extracted from vanilla beans, synthesized chemically from clove oils, or extracted from wood pulp wastes. Vanillin is most likely to be:

a. homogeneous mixture of elements c. solution of C in H and O

b. heterogeneous mixture of elements d. compound of C, O, and H

_____11. Which of the following property is NOT an intensive property of a material?

a. density b. color c. combustible d. melting point e. mass

_____12. The statement, "A chemical reaction never creates products that weigh more or less than the reactants", is based on three centuries of experimental observation. The statement is an example of:

a. theory b. hypothesis c. law d. belief

II. a. Provide the name for each of the following: (12)

FeO _________________________ S4N2 ____________________________

KMnO4____________________________ (NH4)2HPO4 ________________________

H2SO4 ____________________________ MgF2 _____________________________

b. Provide the symbols for each of the following: (12)

phosphorus trihydride________________________ calcium chlorate ___________________

aluminum sulfide ________________________ strontium nitride ___________________

hydrobromic acid __________________________ chromium (III) acetate _________________

III. a. Write the balanced equation for the reaction represented by the boxes below. (4)

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_______________________________________________________________________

b. Balance the following reactions and identify the type of reaction. (6)

Ca(HCO3)2 + H3PO4 à CO2 + H2O + Ca3(PO4)2

Type: ________________________________

P4 + Cl2 à PCl5

Type: ________________________________

c. Complete and balance the following reaction: (4)

AgNO3 + Fe à

d. Write the ion and net ionic equations for the following reaction: (6)

CaBr2 + K3PO4 à Ca3(PO4)2 + KBr

IV. When producing a type of fruit juice the manufacturer needs 6.76 x 10-3 g of sodium benzoate (a preservative) for each quart of juice. How many pounds of sodium benzoate would be needed for a vat of 2.1 x 104 gallons. (10)

454 g = 1 lb 4 qt = 1 gal

V. The density of water is 1.00 g/mL. What will the mass of 5.0 gallons be in pounds?

454 g = 1 lb 4 qt = 1 gal 952 mL = 1 qt (10)

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